Res 1991-148 - Laserfiche WebLink

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§ 36-6 SAN MARCOS RIVER CORRIDOR § 36-7 (1) Channel cross-sections shall be trapezoidal in configuration. (2) Side slopes of channels shall be no steeper than four (4) horizontal to one (1) vertical. (3) For a six-month design storm assuming wet antecedent conditions, channel bottom flow depth shall not exceed four (4) inches and design flow velocity shall not exceed two and one-half (272) feet per second. (4) All constructed and altered drainage channels shall be stabilized and vegetated as soon as practicable after final grading. (5) The director may allow exceptions to the design flow veloc- ities or depths in the following situations in conformance with the purpose of the previous section of this chapter: (a) On lands with greater than fifteen (15) per cent slope, provided that the design flow velocity shall never be greater than three (3) feet per second. (b) In limited transitional channel sections (such as cul- verts, culvert entries and exits, drop sections, sharp bends, and water quality basin entries). (c) Channelization of the San Marcos and Blanco Rivers an¡:l any tributary of the San Marcos River within the SMRC shall be prohibited. (Ord. No. 1985-79, § 1(6), 8-1-85) Sec. 36-7. Ecological preservation. (a) All the requirements, standards, and processes concerning landscaping, buffering, and the preservation of natural vegeta- tion as detailed in Chapter 141f2, landscape and buffering ordi- nance, of the City Code shall be followed within the SMRC. (b) Restoration of disturbed areas that contain native woody and herbaceous plants shall be accomplished only as approved by the director. (c) Stabilization of eroding creek banks is permitted in order to protect threatened property, but only as approved by appropriate federal and state agencies and the director. All such projects shall be designed to stabilize existing conditions only. Supp. No. 20 1060.151